Unbreak saving/loading with TAG_MAJOR_VERSION > 34.
Don't list potions of gain foo among unindentified.
Auto-id rings of rPois upon quaffing a potion of poison.
Make yyerror() static.
Shuffle some function prototypes to correct places.
Inline a trivial function.
Staticify.
Drop unused marshall-to-vector<char>.
Fix a crash and a corner case wrong behaviour.

Somehow, the crash occurs always, but only in LTO builds: checking
skill_progress() with uninitialized species at startup.

The wrong behaviour, on the other hand, applies only to selecting an
item class by glyph in ?/i and only if you redefined an item's glyph
based on its uselessness.
Fix a --test (only) assertion failure.
Fix a --test -DDEBUG_FATAL crash.

There's a (normally non-fatal) error message caused by uninitialized item
descriptions.
Don't print the line number in -DDEBUG_FATAL messages.

A line number in the error handler is useless, and the real line is lost (at
least without traversing the stack).
Fix a --test regression wrt repeatedly placing fixed uniques.
An ugly hack: exempt tentacles from arena faction calculations.

This commit causes problems with freestanding tentacles: if they're the only
members of a side, the fight ends -- but that's certainly better than a
crash.  Such tentacles don't exist except for manual requests, being normally
ever spawned by the spell.
Fix a crash during startup.

For some weird reasons LTO only, and shows up only on Windows, even though
it's in a platform independent part.  The division by zero here is real.